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BS EN ISO 18610:2021

BS EN ISO 18610:2021

$142.49

Fine ceramics (advanced ceramics, advanced technical ceramics). Mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure. Determination of elastic properties by ultrasonic technique

Published By Publication Date Number of Pages
BSI 2021 28
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This document specifies an ultrasonic method to determine the components of the elasticity tensor of ceramic matrix composite materials at room temperature. Young’s moduli shear moduli and Poisson coefficients, can be determined from the components of the elasticity tensor.

This document applies to ceramic matrix composites with a continuous fibre reinforcement: unidirectional (1D), bidirectional (2D), and tridirectional (×D, with 2 < × ≤ 3) which have at least orthotropic symmetry, and whose material symmetry axes are known.

This method is applicable only when the ultrasonic wavelength used is larger than the thickness of the representative elementary volume, thus imposing an upper limit to the frequency range of the transducers used.

NOTE Properties obtained by this method might not be comparable with moduli obtained by ISO 15733, ISO 20504 and EN 12289.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
6 Foreword
7 1 Scope
2 Normative references
3 Terms and definitions
11 4 Principle
12 5 Significance and use
13 6 Test equipment
6.1 Immersion tank with temperature measurement device
6.2 Holder of the probes and test object
6.3 Probes
6.4 Pulse generator
6.5 Signal display and recording system
7 Test object
14 8 Test object preparation
9 Test procedure
9.1 Choice of frequency
15 9.2 Establishment of the test temperature
9.3 Reference test without test object
9.4 Measurement with the test object
9.4.1 Determination of the bulk density and thickness
9.4.2 Mounting of the test object
9.4.3 Acquisition of different angles of incidence
16 10 Calculation
10.1 Delay
10.2 Calculation of the propagation velocities
10.3 Calculation of the refracted angle, θr
17 10.4 Identification of the elastic constants, Cij
10.4.1 Basic considerations
18 10.4.2 Calculation of C33
10.4.3 Calculation of C22, C23 and C44
10.4.4 Calculation of C11, C13 and C55
19 10.4.5 Calculation of C12 and C66
20 10.5 Polar plots of the velocity curves
10.6 Calculation of the quadratic deviation and the confidence interval
21 10.7 Calculation of the engineering constants
11 Test validity
11.1 Measurements
11.2 Criterion of validity for the reliability of the Cij components
12 Test report
23 Annex A (informative) Example of a presentation of the results for a material with orthotropic symmetry
25 Bibliography

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BS EN ISO 18610:2021
$142.49